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CHAPTER 1
New and Changed Information for this Release
The following table provides an overview of the significant changes to this guide for this current release.
The table does not provide an exhaustive list of all changes made to the configuration guides or of the new
features in this release.
•
New and Changed Information for this Release, page 1
New and Changed Information for this Release
The following table provides an overview of the significant changes to this guide for this current release. The
table does not provide an exhaustive list of all changes made to the configuration guides or of the new features
in this release.
Table 1: New and Changed Features
Where DocumentedAdded or
Changed
in
Release
DescriptionFeature
Configuring Switching
Modes, on page 59
5.0(3)U3(1)Added a new chapter about configuring your
switching mode. There are two switching
modes: cut-through and store-and-forward.
Switching Modes
Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)
OL-26590-01 1
- Release 5.0(3)U3(1) 1
- CONTENTS 3
- OL-26590-01 v 5
- OL-26590-01 vii 7
- OL-26590-01 ix 9
- Contents 10
- Audience 11
- Document Conventions 11
- OL-26590-01 xiii 13
- CHAPTER 1 15
- 2 OL-26590-01 16
- Overview 17
- Private VLANs 18
- Spanning Tree 18
- Rapid PVST+ 19
- STP Extensions 19
- 6 OL-26590-01 20
- About the Interface Command 21
- 8 OL-26590-01 22
- Default UDLD Configuration 23
- About Interface Speed 24
- About Port Profiles 25
- About MTU Configuration 25
- Configuring the UDLD Mode 26
- Configuring Interface Speed 28
- Disabling Link Negotiation 29
- Enabling or Disabling CDP 31
- 26 OL-26590-01 40
- Configuring VLANs 41
- VLAN Ranges 42
- Table 4: VLAN Ranges 43
- Configuring a VLAN 44
- Adding Ports to a VLAN 46
- Configuring VTP 48
- Verifying VLAN Configuration 50
- Configuring Private VLANs 51
- Private VLAN Ports 52
- OL-26590-01 39 53
- 40 OL-26590-01 54
- Private VLAN Isolated Trunks 55
- Private VLAN Port Isolation 55
- Configuring a Private VLAN 56
- 48 OL-26590-01 62
- CHAPTER 6 63
- 50 OL-26590-01 64
- Understanding Access VLANs 65
- Understanding Allowed VLANs 66
- Configuring Access Host Ports 68
- Configuring Trunk Ports 68
- 58 OL-26590-01 72
- Configuring Switching Modes 73
- 60 OL-26590-01 74
- Understanding the Bridge ID 78
- Extended System ID 79
- STP MAC Address Allocation 79
- Understanding BPDUs 80
- Election of the Root Bridge 81
- Understanding Rapid PVST+ 82
- Rapid PVST+ BPDUs 83
- 70 OL-26590-01 84
- Protocol Timers 85
- Port Roles 85
- Port States 86
- Blocking State 87
- Learning State 87
- Forwarding State 87
- Synchronization of Port Roles 88
- OL-26590-01 75 89
- Port Cost 90
- Port Priority 91
- Enabling Rapid PVST+ per VLAN 93
- Restarting the Protocol 100
- PurposeCommand 101
- 88 OL-26590-01 102
- Configuring Rapid PVST+ 102
- Information About MST 103
- MST Regions 104
- MST BPDUs 104
- MST Configuration Information 105
- IST, CIST, and CST 105
- 92 OL-26590-01 106
- MST Terminology 107
- Hop Count 108
- Boundary Ports 108
- Figure 16: MST Boundary Ports 109
- Port Cost and Port Priority 110
- Configuring MST 111
- Procedure 112
- Specifying the MST Name 113
- Configuring the Root Bridge 117
- Configuring the Port Priority 119
- Configuring the Port Cost 120
- Configuring the Hello Time 121
- Specifying the Link Type 125
- Verifying MST Configurations 126
- Configuring STP Extensions 127
- Understanding BPDU Guard 128
- Understanding BPDU Filtering 129
- Understanding Loop Guard 130
- Understanding Root Guard 130
- Before You Begin 133
- Enabling BPDU Guard Globally 134
- Enabling Loop Guard Globally 138
- 126 OL-26590-01 140
- Configuring LLDP 141
- Configuring MAC Addresses 145
- Configuring IGMP Snooping 149
- IGMPv1 and IGMPv2 150
- IGMP Snooping Querier 151
- IGMP Forwarding 151
- 138 OL-26590-01 152
- 142 OL-26590-01 156
- CHAPTER 14 157
- 144 OL-26590-01 158
- OL-26590-01 IN-1 161
- IN-2 OL-26590-01 162
- OL-26590-01 IN-3 163
- IN-4 OL-26590-01 164
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